Sun, Jun
Yu, Shengnan
Chen, Jie
Xing, Zhaoyu
Zha, Tingting
Fan, Min
Zeng, Dexing
Xing, Wei
Funding for this research was provided by:
National Natural Science Foundation of China (81771798)
Changzhou Municipal Commission of Health and Family Planning (ZD201509)
Article History
First Online: 27 July 2018
Compliance with ethical standards
:
: This work was supported by the National Natural Science Foundation of China (Grant Numbers 81771798), and major scientific and technological projects of the Changzhou Municipal Commission of Health and Family Planning (Grant Numbers ZD201509).
: All authors declare that they have no conflicts of interest.
: All research procedures were conducted in accordance with the Declaration of Helsinki. The local ethics committee approved this retrospective study.
: Informed consent was obtained from all participants included in the study.